FCS-MBx-SG Megablock range* - Passive hubs for general purpose, Zone 2 & Division 2 fieldbus networks - Eaton MTL
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Technical data
July 2021
MTL fieldbus networks EPS MBx Rev 5
FCS-MBx-SG
Megablock range*
Passive hubs for
general purpose,
Zone 2 & Division 2
fieldbus networks
Megablocks are DIN-rail mounted passive hubs for Foundation™ Connections to the Megablock are made using pluggable, screw-
fieldbus networks. They connect several field devices to the network terminal type connectors. This allows wire terminations to be made to
trunk cable and provide short circuit protection to the segment. the individual connectors which are then plugged into the Megablock.
Megablocks minimize hand wiring and allow individual devices to be Devices can then be connected and disconnected easily during
added to and removed from the segment without disrupting network commissioning. After commissioning, retaining screws are tightened
communication. to secure each connector to the Megablock.
A green power LED on each unit indicates whether at least 9V dc is Trunk connections for the fieldbus home-run/trunk cable are easily
present. Megablocks are available in four, eight, ten and twelve drop identified by their black connectors. Separate numbered connections
versions. Multiple Megablocks are easily wired to one another to allow are provided for each spur drop.
larger segments to be constructed.
SpurGuard™ is a device-port, short circuit protection technique
Megablocks are available with an integral terminator making that minimizes susceptibility to single points of failure. The FCS-MBx-
them ideal for a star or "chickenfoot" topology, where several devices SG Megablocks range has built-in SpurGuard™ protectors that prevent
are connected at a single field junction box. Separate Megablock a short circuit in any of the individual transmitters or spur cable runs,
Terminators are also available, which may be wired easily to any from bringing down the entire fieldbus segment. A red LED near each
Megablock. Megablocks having a built-in terminator are clearly marked spur connection indicates when a spur is shorted and hence in "over-
('T') for easy identification by field personnel. current" mode.
Eaton Electric Limited,
Great Marlings, Butterfield, Luton
Beds, LU2 8DL, UK.
Tel: + 44 (0)1582 723633 Fax: + 44 (0)1582 422283
E-mail: mtlenquiry@eaton.com
www.mtl-inst.com
© 2021 Eaton
All Rights Reserved
Publication No. EPS MBx Rev 5
July 2021MTL FCS-MBx-SG
July 2021
INSTALLATION SPECIFICATIONS
Megablocks can be mounted vertically or horizontally using 35 mm DIN Mounting requirements
rail within a suitable enclosure, such as a field junction box. Megablocks 35mm DIN rail
are removed from the DIN rail using a flat blade screwdriver to release Wire capacity
the mounting platform. Use of DIN rail end stops is recommended to 0.14 to 2.5mm2
prevent sliding in vertical installations. FCS-MBx range Megablocks
Case material
have labeling areas so that segments can be easily identified according
Lexan polycarbonate
to plant standards.
Temperature range
MTL have a wide range of standard junction box designs for use with Operating –45º to +70ºC
Megablocks. See the data sheet for the range of Process JBs. Storage –50º to +85ºC
Voltage required to activate power LED
9.2V dc minimum
Minimum input voltage
10.5V (See Note 1 below)
Maximum input voltage
see certification ratings
Maximum input current
see certification ratings
Trunk-to-trunk voltage drop
0.1V maximum
FCS-MBx-SG, F118 & F215 Megablock
with SpurGuard™
Unloaded current consumption
No. of Ports 4 8 10 12
mA 4.1 4.3 4.4 4.5
Spur device current
46mA maximum (recommend one device per spur)
Spur short-circuit current
60mA maximum
Trunk-to-trunk voltage drop
0.1V maximum
Trunk-to-spur voltage drop
1.1V maximum
PHYSICAL NETWORK
IEC 61158-2
Foundation™ fieldbus H1
Profibus PA
Note 1: The minimum input voltage guarantees that the spur output under full
load will be at least 9.3V so that the device will see at least 9.0V.
Shown above is an example of a common Fieldbus segment topology.
Twelve field devices are connected to a twelve-drop Megablock,
which is mounted in a field junction box. The trunk connector on
the Megablock is wired to the segment trunk cable that leads to the
control room or marshalling panel where the power supply and second
terminator are located.
GROUNDING
To prevent ground loops, a fieldbus segment should only be grounded
at one point. This is usually done by grounding the cable shield at the
control room end of the segment. If a permanent segment ground
connection in the field is desired, this can be achieved by wiring the
shield terminal on one of the Megablock trunk connectors to a suitable
earth ground instead of wiring it to the shield terminal on the Megablock
Terminator.
Fieldbus Connection System (FCS) wiring blocks are protected by U.S. Patents
6,366,437, 6,369,997 and 6,519,125.MTL FCS-MBx-SG
July 2021
CASE DIMENSIONS
4-WAY - FCS-MB4-SG(-T)
FCS-MB4-SG
Trunk
2
Power
1 3
www.mtl-fieldbus.com
Trunk
4
Red Light Indicates
Spur in Short Circuit Mode
8-WAY - FCS-MB8-SG(-T) 10-WAY - F118, FCS-MB10-SG(-T)
FCS-MB10-
FCS-MB8-SG SG-T
Trunk
Trunk
4
Power Power 5
1 5
1 6
2 6
2 7
www.mtl-fieldbus.com
3 7
www.mtl-fieldbus.com
3 8
Trunk
8
Red Light Indicates
Spur in Short Circuit Mode
4 9
Trunk
10
Red Light Indicates
Spur in Short Circuit Mode
Note: Different Megablock versions have minor variations in labelling.MTL FCS-MBx-SG
July 2021
CASE DIMENSIONS (cont)
12-WAY MEGABLOCKS
FCS-MB12-SG(-T) F215
FCS-MB12-SG-T
Trunk F215
Trunk
Power 6 Power 6
1 7 1 7
2 8 2 8
www.mtl-fieldbus.com www.mtl-fieldbus.com
7.16” 7.16”
3 9 182 mm 3 9 182 mm
4 10 4 10
5 11 5 11
Trunk
Trunk
12 12
Red Light Indicates Red Light Indicates
Spur in Short Circuit Mode Spur in Short Circuit Mode
1.98” 1.98”
50.4 mm 50.4 mmMTL FCS-MBx-SG
July 2021
APPROVALS - for full certification information visit www.mtl-inst.com/support/certificates/
MODELS - F118, F215, FCS-MB4-SG-[T], FCS-MB8-SG-[T], FCS-MB10-SG-[T], FCS-MB12-SG-[T]
Country Europe USA Canada
ATEX
Authority FM FM FMc FMc
(Category 3)
Standard EN 60079-0 3600 1998 3600 1998 CSA C22.2 No. 213 :1987 CSA C22.2 No. 213 :1987
EN 60079-15 3611 1999 3611 1999 CSA E60079-0: 2002 CSA E60079-0: 2002
3810 1989 3810 1989 CSA E60079-15: 2002 CSA E60079-15: 2002
CSA C22.2 No.1010.1:1992 CSA C22.2 No.1010.1:1992
+ Amendment 2 1997 + Amendment 2 1997
Approved E II 3 G NI/I/2/ABCD/T4 Ta=70ºC NI-ANI/I/2/ABCD/T4 Ta=70ºC NI-ANI/I/2/ABCD/T4 Ta=70ºC NI/I/2/ABCD/T4 Ta=70ºC
for Ex nA IIC T4 Gc I / 2 / IIC / T4 Ta=70ºC NI-ANI/I/2/IIC/T4 Ta=70ºC Ex nA [nL] IIC T4 Ta=70ºC Ex nA IIC T4 Ta=70ºC
Certificate RELC07A- 3013269 3013852 3039092C 3039410C
no. TEX1001X
Apparatus Non-arcing Non-arcing Non-arcing Non-arcing Non-arcing
parameters
(Trunk)
Cable Non-arcing Non-arcing Non-incendive Non-incendive Non-arcing
parameters Voc = 32V Voc = 32V
(Spur) Isc = 60mA Isc = 60mA
Ca = 85nF Ca = 85nF
La = 0.26mH La = 0.26mH
ORDERING INFORMATION
With SpurGuard™
short-circuit protection
General Purpose
and Zone/Division 2
Megablocks
4 way FCS-MB4-SG
4 way with internal Terminator FCS-MB4-SG-T
8 way FCS-MB8-SG
8 way with internal Terminator FCS-MB8-SG-T
10 way FCS-MB10-SG
10 way with internal Terminator FCS-MB10-SG-T
10 way with switched Terminator F118
12 way FCS-MB12-SG
12 way with internal terminator FCS-MB12-SG-T
12 way with switched Terminator F215
See Fieldbus Terminators datasheet for details of separate, DIN-rail mounted terminators
ACCESSORIES
Description Part Number
Heavy Duty DIN rail end stop ETL7000
35mm DIN Rail, 1 metre length THR7000
Process JB stainless steel‡ FCS-96XX
‡ See Process JB data sheets for further details
Eaton Electric Limited, EUROPE (EMEA): The given data is only intended as a product
Great Marlings, Butterfield, Luton +44 (0)1582 723633 description and should not be regarded as a legal
warranty of properties or guarantee. In the interest
Beds, LU2 8DL, UK. mtlenquiry@eaton.com
of further technical developments, we reserve the
Tel: + 44 (0)1582 723633 Fax: + 44 (0)1582 422283 right to make design changes.
THE AMERICAS:
E-mail: mtlenquiry@eaton.com
+1 800 835 7075
www.mtl-inst.com
mtl-us-info@eaton.com
© 2021 Eaton
All Rights Reserved ASIA-PACIFIC:
Publication No. EPS MBx Rev 5 200721 +65 6 645 9888
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